SOHC.co.uk Forums > CB500/550
New frame/engine bolts. What type?
Oddjob:
I've used those dimpled titanium bolts a lot on my 1300 and whilst they are fine if the head sits horizontally, like it would at the front engine hangers, when the head is vertical, like the head is flat side up, I found that dimple filled with water, that dried with the heat of the engine and discoloured the bolt head quite quickly, I ended up filling the dimple with paint to stop it.
DomP:
Oh b@gg@r, I ordered from Middletons but thought the 14mm headed M10 bolts were metric fine so ordered some nuts on Ebay, turns out they are 1.25mm thread pitch.
McCabe-Thiele (Ted):
--- Quote from: DomP on November 30, 2023, 06:26:59 PM ---Oh b@gg@r, I ordered from Middletons but thought the 14mm headed M10 bolts were metric fine so ordered some nuts on Ebay, turns out they are 1.25mm thread pitch.
--- End quote ---
You are not alone Dom in finding confusion with metric threads - it does not help that some sellers do not seem to state thread pitch plus the parts manual might mention diameter & length but naff all about pitch or head size.
Many decades ago I had a simple alloy tool that was a rectagular plate with common british thread sizes marked on it (AF & BSF, BA etc). If you were not sure of a thread size you screwed your bolt in by hand to find the right siize. You could also check nut sizes by sizing a bolt then trying your nut on an identified bolt.
It was a promotional tool at the garage where I worked - it came free with some red tins of fastners by a manufacturer - forget the brand name now something like Tewul ?
DomP:
--- Quote from: McCabe-Thiele (Ted) on November 30, 2023, 10:32:50 PM ---
--- Quote from: DomP on November 30, 2023, 06:26:59 PM ---Oh b@gg@r, I ordered from Middletons but thought the 14mm headed M10 bolts were metric fine so ordered some nuts on Ebay, turns out they are 1.25mm thread pitch.
--- End quote ---
You are not alone Dom in finding confusion with metric threads - it does not help that some sellers do not seem to state thread pitch plus the parts manual might mention diameter & length but naff all about pitch or head size.
Many decades ago I had a simple alloy tool that was a rectagular plate with common british thread sizes marked on it (AF & BSF, BA etc). If you were not sure of a thread size you screwed your bolt in by hand to find the right siize. You could also check nut sizes by sizing a bolt then trying your nut on an identified bolt.
It was a promotional tool at the garage where I worked - it came free with some red tins of fastners by a manufacturer - forget the brand name now something like Tewul ?
--- End quote ---
Yes Ted, confusing but thankfully it was only four nuts that I ordered in m10 x 1mm on Ebay. Hopefully I'll get the lower half of the engine in the frame soon then when Bryan has finished reporting my barrels I can get it all together🤞
davidcumbria:
Same here. Took me three purchasing attempts until I got the thread correct for the M12 foot peg engine mount nuts. I have got better at measuring an existing bolt with a ruler and counting along 10 threads to see if it s 1.0 , 1.25 or 1.5cm etc. unless you specifically select a fine thread all the stainless bolts sellers use the standard coarse thread but there are plenty of tables which list all the metric thread sizes on google so you can home in on whether it’s what you need. It’sbeen satisfying to get to know this stuff - this week I was looking for a helicoil set for the carb drain screw m6 x0.8 fine - that was not easy to find. Problem if you get it wrong the postage cost for a small delivery from middletons is prohibitive so I think that’s why I resorted to getting the odd bolt from china on eBay.
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